UFC on ESPN 55: Nicolau vs. Perez was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on April 27, 2024, at the UFC Apex facility, in Enterprise, Nevada, United States. A flyweight match between Matheus Nicolau and UFC Flyweight Championship challenger Alex Perez served as the headliner.

• Ultimate Fighting Championship
• Zuffa
• Alex Perez
• Matheus Nicolau
• Bogdan Guskov
• Ryan Spann
• Karine Silva
• Ariane Lipski da Silva
• Jhonata Diniz
• Austen Lane